1BRD

Model for the structure of Bacteriorhodopsin based on high-resolution Electron Cryo-microscopy

ELECTRON CRYSTALLOGRAPHY

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 62.45	α = 90
b = 62.45	β = 90
c = 100	γ = 120

Symmetry
Space Group	P 3

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	electron

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	Mean Isotropic B
ELECTRON CRYSTALLOGRAPHY		3.5

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1343
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms	20

Sample
Bacteriorhodopsin from purple membrane

Specimen Preparation
Sample Aggregation State	2D ARRAY
Embedding Material	glucose
Embedding Details	0.8% (w/v) glucose

3D Reconstruction
Reconstruction Method	CRYSTALLOGRAPHY
Number of Particles
Reported Resolution (Å)	3.5
Resolution Method	DIFFRACTION PATTERN/LAYERLINES
Other Details
Refinement Type
Symmetry Type	2D CRYSTAL
Space Group Name	P 3
Length a	62.45
Length b	62.45
Angle Gamma	120

Data Acquisition
Detector Type	GENERIC FILM	GENERIC FILM	GENERIC FILM
Electron Dose (electrons/Å**2)	20	15

Imaging Experiment	1	2	3
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI/PHILIPS EM420	SIEMENS SULEIKA	JEOL 100B
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging Mode	DIFFRACTION	BRIGHT FIELD	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification		66000	55000
Calibrated Magnification
Source			FIELD EMISSION GUN
Acceleration Voltage (kV)	120	100	100
Imaging Details	60 degree tilted specimens	0, 20, 45 degree + random degree tilts	, 20, 45 degree + random degree tilts

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.